/*
 * Copyright (c) 2010-2011, Monash e-Research Centre
 * (Monash University, Australia)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 	* Redistributions of source code must retain the above copyright
 * 	  notice, this list of conditions and the following disclaimer.
 * 	* Redistributions in binary form must reproduce the above copyright
 * 	  notice, this list of conditions and the following disclaimer in the
 * 	  documentation and/or other materials provided with the distribution.
 * 	* Neither the name of the Monash University nor the names of its
 * 	  contributors may be used to endorse or promote products derived from
 * 	  this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package edu.monash.merc.shutdownhook;

import java.beans.Introspector;
import java.sql.Driver;
import java.sql.DriverManager;
import java.util.Enumeration;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 * CleanupListener ServletContextListener implementation class
 *
 * @author Simon Yu - Xiaoming.Yu@monash.edu
 * @version 2.0
 */
public class CleanupListener implements ServletContextListener {

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        try {
            Introspector.flushCaches();
            for (Enumeration<Driver> e = DriverManager.getDrivers(); e.hasMoreElements(); ) {
                Driver driver = e.nextElement();
                if (driver.getClass().getClassLoader() == getClass().getClassLoader()) {
                    DriverManager.deregisterDriver(driver);
                }
            }
        } catch (Throwable e) {
            System.err.println("Failled to cleanup ClassLoader for webapp");
            e.printStackTrace();
        }

    }

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        // TODO Auto-generated method stub
    }
}